/**
 * v-debounce
 * 按钮防抖指令，可自行扩展至input
 * 接收参数：function类型
 */
import type { Directive, DirectiveBinding } from 'vue'

interface ElType extends HTMLElement {
  __handleClick__: () => any
}

export default {
  mounted(el: ElType, binding: DirectiveBinding) {
    if (typeof binding.value !== 'function')
      throw new Error('callback must be a function')

    let timer: NodeJS.Timeout | null = null
    el.__handleClick__ = function () {
      if (timer)
        clearInterval(timer)

      timer = setTimeout(() => {
        binding.value()
      }, 500)
    }
    el.addEventListener('click', el.__handleClick__)
  },
  beforeUnmount(el: ElType) {
    el.removeEventListener('click', el.__handleClick__)
  },
} as Directive
